(Reuters, DPA - 19/02/10, Standart, Dnevnik, Πρακτορείο ειδήσεων Focus, The Banker -16/02/10, Bulgarian Energy Holding, Εθνική Επιχείρηση Ηλεκτρισμού, Κρατική Ρυθμιστική Επιτροπή Ενέργειας και Υδάτων)
(Reuters, DPA - 19/02/10; Standart, Dnevnik, Agenţia de Ştiri Focus, Bancherul -16/02/10; Holdingul Energetic Bulgar, Compania Naţională de Electricitate, Comisia Naţională de Reglementare în Domeniul Energiei şi Apelor)